Patents by Inventor Fredj Fitoussi

Fredj Fitoussi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5968341
    Abstract: The invention provides an activated silica enriched mazzite having a chemical formula in the anhydrous state, expressed in molar ratios of:a M.sub.2/n O; Al.sub.2 O.sub.3 ; b SiO.sub.2 ;with a variation from 0 to 0.5, M being an alkaline cation of valency n and b being greater than 7, and which has an acid strength corresponding to an amount of heat measured by ammonia absorption microcalorimetry, greater than 190 KJ/mol, and a pore volume, measured by cyclohexane adsorption, greater than 0.09 ml/g. The activated mazzites are useful in the conversion of hydrocarbons, in particular, the isomerization of C.sub.4 to C.sub.8 paraffin, and as molecular sieves in processes for the separation of hydrocarbons.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: October 19, 1999
    Assignee: Elf Aquitaine
    Inventors: Francesco Di Renzo, Francois Fajula, Fredj Fitoussi, Philippe Schulz
  • Patent number: 5534239
    Abstract: Process for the synthesis of a silica-enriched crystalline aluminosilicate having the offretite structure from a nucleation gel A containing sources of silicon, aluminium, alkali metal ions, an organic structuring agent and water and a growth gel B containing sources of silicon, aluminium, alkali metal ions and water. The crystals formed are calcined, the ions are replaced by protons and the crystals are subjected to a hydrothermal treatment followed by a treatment with a strong mineral acid. The aluminosilicate formed has a good selectivity in acid catalysis reactions and is characterized by its good stability.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: July 9, 1996
    Assignee: Societe Nationale Elf Aquitaine
    Inventors: Francois Fajula, Joel Patarin, Thierry Des Courieres, Fredj Fitoussi
  • Patent number: 5451391
    Abstract: Process for the preparation of a crystalline aluminosilicate enriched in silica, having the structure of mazzite, by hydrothermal crystallization of a gel containing sources of silicon, aluminum and alkali metal ions, in the presence of an organic structuring agent, characterized in that the source of aluminum is a zeolite Y in the form of spheres. The mazzite obtained does not contain any silicoalumina debris out of the lattice. It is employed as catalyst for the conversion of hydrocarbons or as molecular sieve.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: September 19, 1995
    Assignee: Societe Nationale Elf Aquitaine
    Inventors: Francesco Di Renzo, Francois Fajula, Nisso Barbouth, Fredj Fitoussi, Philippe Schulz, Thierry des Courrieres
  • Patent number: 4237052
    Abstract: A process for the preparation of bitumen-polymer compositions, characterized by the fact that the bitumens are modified by grafting of a dihalopolybutadiene polymer that serves as a receptive structure to block polymers and to elastomers co-vulcanizable with the grafted bitumen.The elastomers are selected from the group that includes linear polybutadiene-polystyrene block copolymers, a polystyrene-polybutadiene block copolymer, and a vulcanizable polynorbornene rubber. They are used as road and industrial bitumens.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: December 2, 1980
    Assignee: Elf Union
    Inventors: Fredj Fitoussi, Paul Maldonado